本文旨在研製具單相功因校正之直流無刷電動機速度控制系統，主要包括兩個部分:雙臂交錯式昇壓型轉換器之單相功因校正電路，以及無感測器三相無刷直流電動機控制系統，俾分別用於市電側及電動機負載端。前者可得電源側高功因、低電流諧波含量、降低直流鏈電壓漣波、縮小儲能電感體積以及增加電源密度;而後者則採用無感測器控制方式驅動，透過偵測電動機的感應電動勢相電壓零點，獲得實際轉速，再藉由微控制器整合上述功能方塊，依據轉速命令和實際速度之間的轉速誤差，對交錯式功因校正器進行動態升壓調節。此方法可降低電動機換流器之切換損失，提高電動機運轉效能，亦可得單相電源側高功因及低電流諧波含量的功能。
本系統之輸入市電電壓為單相交流電壓110V，頻率為60Hz，功因校正之單相交錯式功率轉換器的直流鏈電壓控制範圍在190V至380V；三相無刷直流電動機轉速範圍為1160rpm至2160rpm之間。三相無刷直流電動機在2160rpm、2N-m 下，透過直流鏈動態昇壓及轉速控制之測試，得市電側功率因數0.996，電流總諧波失真率5.38%，整機效率87.1%。實測結果驗證了本文系統之可行性。

This thesis aims to design and implement a speed control system for brushless dc (BLDC) motors with single-phase power factor correction (PFC). The system contains two major parts: the boost type PFC with two-phase interleaving control and sensor-less control for three phase BLDC motors used, respectively, on the grid and load sides. The former can yield high power factor as well as low total harmonic distortion (THD) on the input, and ripple voltage reduction of the dc-link, thereby reducing the inductance volume and increasing the power density. While the latter is driven by sensor-less control via detecting zero-induced electro-motive-force to obtain the actual motor speed. A microcontroller is used to control the two functional blocks mentioned above and conduct dynamic voltage boosting regulation on the interleaving PFC in accordance with the error speed between commanding and actual motor speeds. The proposed control method can reduce switching loss of three-phase inverter, improve the operation efficiency of motor, keep high input power factor and low current THD.
The single-phase input voltage is 110V, 60Hz and the dc-link voltage range of power factor correction is from 190V to 380V. The speed range of BLDC motor under control is from 1160rpm to 2160rpm. Experimental results show that for the BLDC under 2160rpm and 2 N-m, dynamic voltage boosting regulation and speed control give the current THD of 5.38%, the input power factor of 0.996 and the overall efficiency of 87.1%. The feasibility of the proposed system is verified experimentally.

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